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Re: RCA P52921 changed channels by itself and unplugged...
you have defective tact switches! at the panel board front of your TV thats why your Tv System is in abnormal function!. If you have experience in electronic repairing you can change all tact switches at the front panel board.
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Ur tv have a problems known as a convergence problems,it dead.The tv convergence board require the 2 STK convergence ICS and some or all it resistors,must be change to solved the convergence problems.The shop will cost u $300-350 for parts and labors.
Out of 30 years in the repair field, I have seen this problem maybe 4 times. Once was a stuck button on the keypad of the tv. The other time was a second remote control with a book sitting on it and it would turn the tv on and off when someone would move something on the coffee table, another time was a bad solder connections on the microprocessor on the keypad circuit board and the last time was from a humorous neighbor in an apartment complex who thought he was funny who had an all in one remote control programmed for his neighbor's tv set.
If you can find the horizontal output transistor which is located near the flyback transformer,one lead of this drive transformer is connected to the base lead. (horizontal output transistor). There may be a little coil in series with this lead going to the transistor.